These are the third party libraries used by MuPDF.

Library Version Function License
Required:
freetype2.6.3Font scaling and rendering BSD-style
harfbuzz1.3.2 with patches Text shaping MIT-style
libjpeg9.0 with patches JPEG decoding BSD-style
Incompatible fork of lcms22.9rc1 with patchesColor management MIT-style
openjpeg2.1.0 with patches JPEG 2000 decoding BSD-style
zlib1.2.7Deflate compression zlib License
Optional:
FreeGLUT3.0.0 with patches OpenGL API for UIMIT-style
curl7.51.0 with patches HTTP data transfer MIT-style
Luratech JP2N/AJPEG 2000 decoding commercial
Luratech JBIG2N/AJBIG2 decoding commercial
JPEG-XR reference1.8 with patches JPEG-XR decoding special

NOTE: jbig2dec and MuJS are included in "thirdparty" but are copyright Artifex Software Inc.